Clamping mechanism for drop-leaf sewing-machine stands.



` G.B.GULBGR0VE. GLAMPING MBGHANISM POR` DROP LEAF SEWING MACHINESTANDS.

APPLIGATIGN FILED APL, 1911.

Patented July 11, 1911.

NITEI) STATES .PATENT OFFICE.

CHARLES E. COLEGROVE, OF CLEVELAND,

OHIO, ASSIGNOR TO THE WHITE SEWING: MACHINE COMPANY, OF CLEVELAND, OHIO,A CORPORATION OF OHIO.

CLAMPING MECHANISM FOR DROP-LEAF SEWING-MACHINE STANDS.

Specification of Letters Patent. Patented July 11, 1911-?.

Application filed April 24, 1911. Serial No. 623,112. f

To all whom it may concern.:

Be it known that I, CHARLES E. ConncRovE, a citizen of the UnitedStates, residing at Cleveland, in the county of Cuyahoga and State ofOhio, have invented a certain new and useful Improvement in ClampingMechanism for Drop-Leaf Sewing-Machine Stands, of which the following isa full, clear, and exact description.

This invention relates to improvements in drop leaf sewing machinestands.

The object of the invention is to provide means whereby, when thedrop-leaf is lowered beyond its horizontal operative position, thedriving belt will be so clamped to the drop-leaf that it must maintainits operative engagement with the driving wheel of the sewing machinehead.

The invention consists in the combination with a drop-leaf havingvertical clamping surfaces, of a spring actuated clamp adapted to engagewith the fixed top of the sewing machine stand when the drop-leaf is inoperative position, and to be thereby held out of action, but toautomatically act to clamp both legs of the belt against the clampingsurfaces referred to when the drop-leaf is lowered.

The invention also consists of the more specific construction andcombination of parts shown in the drawings and hereinafter described anddefinitely pointed out in the claims.

In the drawing, Figure l is a plan view of a drop-leaf sewing machinestand. Fig. 2 is an end view thereof when the sewing machine head islixed to the drop-leaf and when the drop-leaf is swung down a littlefrom its operative horizontal position. Fig. 3 is a front elevation,with the stand top partly sectioned, of one end of said sewing machinestand and one end of a sewing machine head.

Referring to the parts by letters, A represents the top of a sewingmachine stand; and B represents the drop-leaf thereof, said leaf beinghinged along its front edge to the front edgev of the hole in the standtop which the leaf is adapted to lill. C represents a sewing machinehead which is lixed to this drop-leaf, the driving` wheel of said headbeing indicated by F. D represents the driving belt, the two legs ofwhich pass from this wheel down through slots ol in the drop-leaf. E, Erepresent fixed clamping members which are permanently fixed I to theunder side of the drop-leaf adjacent o these slots d.

Gr represents a movable clamping device which lies on the opposite sidesof the two belt legs, and is adapted, under certain conditions to beexplained, to automatically clamp the belt legs to the fixed clampingmembers E. In the form shown the movable clamping device is a stiff wirebail pivoted in bearings b on the underside of the dropleaf, andprovided with an arm g which, as the drop-leaf assumes its horizontalposition, will engage a fixed part of the table, whereby the clampingmember will be rocked in the direction which will release .its grip uponthtl telt legs. A small spring H connected with the bail and thedrop-leaf may impart to it the described clampin movement as soon as theleaf is lowere so as to carry the arm g out of engagement with the tableA. It will be understood that this particular automatic clamp is not anessential part of the invention generically defined, and that any othersuitable clamping device arranged substantially as described withrespect to the belt legs and fixed to clamping members may be used inrits stead, provided there is also provided some means for engaging withthe table or something fixed to it for moving this clamping member inthe belt releasing direction.

It is obvious that as the drop-leaf is moved down, the belt will beclamped and will thereby be held in operative engagement with the wheelF. When the leaf is in its horizontal position the 1welt is released andmay beslipped otl' of the wheel and on again as the operator may desire,without any interference from the clamping device.

Having described my invention. I claim:

1. AIn a drop-leaf sewing machine stand, the combination of thedrop-leaf thereof and having'clamping members fixed to it adjacent tothe driving belt, of a movable clamping member adapted to clamp the legsof the driving belt against the clamping members when the drop leaf islowered, and means connected with the movable clampingv member adaptedto engage with a fixed part of a sewing machine stand as the drop-leafis moved to its horizontal position to thereby move the clamping memberin the belt releasing direction.

2. In a drop-leaf sewing machine stand, drop-leaf is closed, and aspring for moving 10 the Combination of the drop-leaf thereof saidplvoted clamping member in the belt having clamping members iXed to itadclamping direction.

jacent tothe driving belt, with a clamping In testimony whereof, Ihereunto afiX my frame pivoted to the under side of the dropsignature inthe presence of two Witnesses. leaf and adapted to clamp the belt tosaid CHARLES E. COLEGROVE. fixed Clamping members, said frame havingVitnesSes:

an arm projecting to a position to be en- IVM. GROTHE,

gaged by a fixed part of the stand When the I-I. A. LOWES.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C. if

